Mercurial > prosody-hg

annotate util/dns.lua @ 12288:08a933450922

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util.dns: Replace base16 implementation with util.hex Less code!
author Kim Alvefur <zash@zash.se>
date Tue, 15 Feb 2022 13:03:02 +0100
parents dd15f42f6312
children 3a655adf1d0d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10961
f93dce30089a util.dns: Library for decoding DNS records
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1 -- libunbound based net.adns replacement for Prosody IM
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2 -- Copyright (C) 2012-2015 Kim Alvefur
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3 -- Copyright (C) 2012 Waqas Hussain
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4 --
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5 -- This file is MIT licensed.
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6
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7 local setmetatable = setmetatable;
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8 local table = table;
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9 local t_concat = table.concat;
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10 local t_insert = table.insert;
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11 local s_byte = string.byte;
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12 local s_format = string.format;
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13 local s_gsub = string.gsub;
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14 local s_sub = string.sub;
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15 local s_match = string.match;
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16 local s_gmatch = string.gmatch;
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17
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18 local have_net, net_util = pcall(require, "util.net");
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19
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d0dfd48806f9 util.dns: Move DNS parameters details into util.dnsregistry
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20 local iana_data = require "util.dnsregistry";
10961
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21 if have_net and not net_util.ntop then -- Added in Prosody 0.11
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22 have_net = false;
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23 end
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24
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08a933450922 util.dns: Replace base16 implementation with util.hex
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25 local tohex = require "util.hex".to;
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26
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27 -- Simplified versions of Waqas DNS parsers
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28 -- Only the per RR parsers are needed and only feed a single RR
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29
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30 local parsers = {};
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31
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32 -- No support for pointers, but libunbound appears to take care of that.
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33 local function readDnsName(packet, pos)
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34 if s_byte(packet, pos) == 0 then return ".", pos+1; end
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35 local pack_len, r, len = #packet, {};
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36 pos = pos or 1;
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37 repeat
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38 len = s_byte(packet, pos) or 0;
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39 t_insert(r, s_sub(packet, pos + 1, pos + len));
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40 pos = pos + len + 1;
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41 until len == 0 or pos >= pack_len;
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42 return t_concat(r, "."), pos;
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43 end
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44
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45 -- These are just simple names.
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46 parsers.CNAME = readDnsName;
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47 parsers.NS = readDnsName
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48 parsers.PTR = readDnsName;
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49
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50 local soa_mt = {
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51 __tostring = function(rr)
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52 return s_format("%s %s %d %d %d %d %d", rr.mname, rr.rname, rr.serial, rr.refresh, rr.retry, rr.expire, rr.minimum);
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53 end;
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54 };
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55 function parsers.SOA(packet)
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56 local mname, rname, offset;
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57
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58 mname, offset = readDnsName(packet, 1);
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59 rname, offset = readDnsName(packet, offset);
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60
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61 -- Extract all the bytes of these fields in one call
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62 local
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63 s1, s2, s3, s4, -- serial
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64 r1, r2, r3, r4, -- refresh
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65 t1, t2, t3, t4, -- retry
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66 e1, e2, e3, e4, -- expire
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67 m1, m2, m3, m4 -- minimum
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68 = s_byte(packet, offset, offset + 19);
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69
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70 return setmetatable({
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71 mname = mname;
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72 rname = rname;
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73 serial = s1*0x1000000 + s2*0x10000 + s3*0x100 + s4;
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74 refresh = r1*0x1000000 + r2*0x10000 + r3*0x100 + r4;
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75 retry = t1*0x1000000 + t2*0x10000 + t3*0x100 + t4;
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76 expire = e1*0x1000000 + e2*0x10000 + e3*0x100 + e4;
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77 minimum = m1*0x1000000 + m2*0x10000 + m3*0x100 + m4;
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78 }, soa_mt);
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79 end
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80
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81 function parsers.A(packet)
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82 return s_format("%d.%d.%d.%d", s_byte(packet, 1, 4));
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83 end
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84
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85 local aaaa = { nil, nil, nil, nil, nil, nil, nil, nil, };
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86 function parsers.AAAA(packet)
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87 local hi, lo, ip, len, token;
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88 for i = 1, 8 do
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89 hi, lo = s_byte(packet, i * 2 - 1, i * 2);
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90 aaaa[i] = s_format("%x", hi * 256 + lo); -- skips leading zeros
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91 end
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92 ip = t_concat(aaaa, ":", 1, 8);
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93 len = (s_match(ip, "^0:[0:]+()") or 1) - 1;
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94 for s in s_gmatch(ip, ":0:[0:]+") do
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95 if len < #s then len, token = #s, s; end -- find longest sequence of zeros
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96 end
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97 return (s_gsub(ip, token or "^0:[0:]+", "::", 1));
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98 end
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99
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100 if have_net then
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101 parsers.A = net_util.ntop;
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102 parsers.AAAA = net_util.ntop;
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103 end
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104
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105 local mx_mt = {
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106 __tostring = function(rr)
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107 return s_format("%d %s", rr.pref, rr.mx)
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108 end
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109 };
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110 function parsers.MX(packet)
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111 local name = readDnsName(packet, 3);
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112 local b1,b2 = s_byte(packet, 1, 2);
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113 return setmetatable({
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114 pref = b1*256+b2;
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115 mx = name;
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116 }, mx_mt);
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117 end
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118
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119 local srv_mt = {
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120 __tostring = function(rr)
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121 return s_format("%d %d %d %s", rr.priority, rr.weight, rr.port, rr.target);
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122 end
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123 };
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124 function parsers.SRV(packet)
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125 local name = readDnsName(packet, 7);
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126 local b1, b2, b3, b4, b5, b6 = s_byte(packet, 1, 6);
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127 return setmetatable({
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128 priority = b1*256+b2;
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129 weight = b3*256+b4;
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130 port = b5*256+b6;
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131 target = name;
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132 }, srv_mt);
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133 end
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134
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135 local txt_mt = { __tostring = t_concat };
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136 function parsers.TXT(packet)
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137 local pack_len = #packet;
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138 local r, pos, len = {}, 1;
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139 repeat
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140 len = s_byte(packet, pos) or 0;
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141 t_insert(r, s_sub(packet, pos + 1, pos + len));
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142 pos = pos + len + 1;
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143 until pos >= pack_len;
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144 return setmetatable(r, txt_mt);
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145 end
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146
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147 parsers.SPF = parsers.TXT;
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148
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149 -- Acronyms from RFC 7218
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150 local tlsa_usages = {
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151 [0] = "PKIX-CA";
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152 [1] = "PKIX-EE";
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153 [2] = "DANE-TA";
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154 [3] = "DANE-EE";
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155 [255] = "PrivCert";
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156 };
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157 local tlsa_selectors = {
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158 [0] = "Cert",
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159 [1] = "SPKI",
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160 [255] = "PrivSel",
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161 };
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162 local tlsa_match_types = {
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163 [0] = "Full",
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164 [1] = "SHA2-256",
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165 [2] = "SHA2-512",
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166 [255] = "PrivMatch",
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167 };
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168 local tlsa_mt = {
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169 __tostring = function(rr)
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170 return s_format("%s %s %s %s",
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171 tlsa_usages[rr.use] or rr.use,
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172 tlsa_selectors[rr.select] or rr.select,
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173 tlsa_match_types[rr.match] or rr.match,
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174 tohex(rr.data));
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175 end;
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176 __index = {
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177 getUsage = function(rr) return tlsa_usages[rr.use] end;
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178 getSelector = function(rr) return tlsa_selectors[rr.select] end;
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179 getMatchType = function(rr) return tlsa_match_types[rr.match] end;
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180 }
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181 };
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182 function parsers.TLSA(packet)
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183 local use, select, match = s_byte(packet, 1,3);
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184 return setmetatable({
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185 use = use;
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186 select = select;
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187 match = match;
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188 data = s_sub(packet, 4);
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189 }, tlsa_mt);
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190 end
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191
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192 local svcb_params = {"alpn"; "no-default-alpn"; "port"; "ipv4hint"; "ech"; "ipv6hint"};
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193 setmetatable(svcb_params, {__index = function(_, n) return "key" .. tostring(n); end});
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194
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195 local svcb_mt = {
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196 __tostring = function (rr)
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197 local kv = {};
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198 for i = 1, #rr.fields do
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199 t_insert(kv, s_format("%s=%q", svcb_params[rr.fields[i].key], tostring(rr.fields[i].value)));
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200 -- FIXME the =value part may be omitted when the value is "empty"
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201 end
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202 return s_format("%d %s %s", rr.prio, rr.name, t_concat(kv, " "));
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203 end;
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204 };
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205 local svbc_ip_mt = {__tostring = function(ip) return t_concat(ip, ", "); end}
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206
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207 function parsers.SVCB(packet)
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208 local prio_h, prio_l = packet:byte(1,2);
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209 local prio = prio_h*256+prio_l;
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210 local name, pos = readDnsName(packet, 3);
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211 local fields = {};
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212 while #packet > pos do
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213 local key_h, key_l = packet:byte(pos+0,pos+1);
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214 local len_h, len_l = packet:byte(pos+2,pos+3);
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215 local key = key_h*256+key_l;
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216 local len = len_h*256+len_l;
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217 local value = packet:sub(pos+4,pos+4-1+len)
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218 if key == 1 then
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219 value = setmetatable(parsers.TXT(value), svbc_ip_mt);
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220 elseif key == 3 then
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221 local port_h, port_l = value:byte(1,2);
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222 local port = port_h*256+port_l;
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223 value = port;
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224 elseif key == 4 then
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225 local ip = {};
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diff changeset
226 for i = 1, #value, 4 do
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227 t_insert(ip, parsers.A(value:sub(i, i+3)));
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diff changeset
228 end
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diff changeset
229 value = setmetatable(ip, svbc_ip_mt);
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diff changeset
230 elseif key == 6 then
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diff changeset
231 local ip = {};
ffd66b461f6a util.dns: Implement SVCB record parser
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diff changeset
232 for i = 1, #value, 16 do
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diff changeset
233 t_insert(ip, parsers.AAAA(value:sub(i, i+15)));
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diff changeset
234 end
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diff changeset
235 value = setmetatable(ip, svbc_ip_mt);
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diff changeset
236 end
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diff changeset
237 t_insert(fields, { key = key, value = value, len = len });
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diff changeset
238 pos = pos+len+4;
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diff changeset
239 end
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diff changeset
240 return setmetatable({
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diff changeset
241 prio = prio, name = name, fields = fields,
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diff changeset
242 }, svcb_mt);
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diff changeset
243 end
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diff changeset
244
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diff changeset
245 parsers.HTTPS = parsers.SVCB;
ffd66b461f6a util.dns: Implement SVCB record parser
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diff changeset
246
10961
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diff changeset
247 local params = {
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diff changeset
248 TLSA = {
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249 use = tlsa_usages;
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diff changeset
250 select = tlsa_selectors;
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parents:
diff changeset
251 match = tlsa_match_types;
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parents:
diff changeset
252 };
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parents:
diff changeset
253 };
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parents:
diff changeset
254
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diff changeset
255 local fallback_mt = {
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diff changeset
256 __tostring = function(rr)
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diff changeset
257 return s_format([[\# %d %s]], #rr.raw, tohex(rr.raw));
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diff changeset
258 end;
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parents:
diff changeset
259 };
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parents:
diff changeset
260 local function fallback_parser(packet)
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parents:
diff changeset
261 return setmetatable({ raw = packet },fallback_mt);
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parents:
diff changeset
262 end
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parents:
diff changeset
263 setmetatable(parsers, { __index = function() return fallback_parser end });
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parents:
diff changeset
264
f93dce30089a util.dns: Library for decoding DNS records
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parents:
diff changeset
265 return {
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parents:
diff changeset
266 parsers = parsers;
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d0dfd48806f9 util.dns: Move DNS parameters details into util.dnsregistry
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diff changeset
267 classes = iana_data.classes;
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diff changeset
268 types = iana_data.types;
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diff changeset
269 errors = iana_data.errors;
10961
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diff changeset
270 params = params;
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271 };